bushwhacker Syllabification: (bush·whack·er)Pronunciation: /ˈbo͝oSHˌ(h)wakər/Definition of bushwhacker noun 1North American & Australian/New Zealand a person who clears woods and bush country. a person who lives or travels in bush country. 2US a guerrilla fighter (originally in the American Civil War). bushwhacker in other Oxford dictionaries Definition of bushwhacker in the British & World English dictionary